Adjustable feed for tools



June 6, 1944.

D. T. PEDEN ADJUSTABLE FEED FOR TOOLS 'r sheets-sheet 1 Fild Nov. 13, 1940 INVENTOR Yzg [4.7 t/Madd,

June 6, 1944. i D T PEDEN 2,350,527

ADJUSTABLE FEED FOR TOOLS Filed Nov. 15, 1940 7 Sheets-Sheet 2 ATTO EYJ- June 6, 1944. D. T. PEDEN n ADJUSTABLE FEED `FOR TOOLS 7 sheets-sheet4 s ,Filed Nov. 1:5, 1940 INVENTOR azzlvgld; Tan.

BY y/Maaa,

ADJUSTABLE FEEDKFOB TooLs Filed Nov. 13, 1940 7 Sheets-Sheet 4 June 6, L1944. D. T. PEDEN ADJUSTABLE FEED FOR TOOLS Filed Nov. 13, 1940 `'7 Sheets-Sheet 5 ATToR INVENToR yzfau, Y YS- June 6, 1944. D. T. PEDEN 2,350,527

- ADJUSTABLE FEED FOR TooLs Filed Nov. 1:5, 1940 7 Sheets-sheet e INVENTOR' "glas TZaZ/f.

June 6, 1944.

D. T. PEDENv ADJUSTABLE FEED FOR TOOLS' Filed oy. 13, 1940 'ISheets-Sheet 7 Y/' EY5.

yATro Patented June 6, 1944 ADJUSTABLE FEED ron 'rooLs Douglas T. Peden, Ann Arbor, Mich., assignor to Micromatio Hone Corporation, Detroit, Mich., a corporation of Michigan Application November 13, 1940, Serial No. 365,526

18 Claims.

This invention relates to honing machines, and particularly to a honing machine of new and novel construction which machines a workpiece to accurate dimension while compensating for Athe stone wear which occurs during the machinsupplied to the end 'of an encompassing cylinder.

The opposite end of the spindle from that supporting the tool is provided with a driving and adjusting shaft by which the degree of reciprocation of the tool may be regulated. An adjustable swash plate is employed for producing the reciprocation of the spindle at a predetermined speed relative to the rotation, which relationship may be varied. A unique mechanism is provided for expanding and contracting the abrasive stones of the tools independent of the movement of the piston. The sleeve for operating' the additional expanding mechanism neither` reciprocates or rotates and is thereby available to the operator for advancing its Aposition in rotation to feed the abrasive stones radially during the operation of the honing tool. An actuating mechanism is provided for advancing the adjusting sleeve which produces the automatic expansion of the abrasive stones during the machining operation. Adjusting mechanism is employed which, upon returning the stones to initial -posi tion, may be set to compensate for the amount of stone wear which occurred during the -prior operation so that production honing may be accomplished by the device. That is to say, the device is capable of machining all of a number of workpieces to a desired diameter without requiring adjustment of the tool for each ofthe workpieces being machined, as has been necessary in the past.

Accordingly, the main objects of my invent ing them further towardl the wall during the machining operation: to provide a tool with mechanism which expands the cutting elements thereof into engagement with the cylinder wall with a snap action and which progressively expands the elements at a predetermined rate as the lmachining operation progresses; to expand the abrasive stones of a honing tool progressively toward a cylinder wall during a honing operation aty a predetermined rate and retract the stones a less amount after the operation to compensate for the ywear of the stones during the machining operation; to provide a machine which operates a honing tool in reciprocation and rotation with a support fqr a workpiece which reciprocates the workpiece over the tool which has its stones expanded progressively during the machining operation and retracted thereafter a less amount equal to the loss of stone diameter; and in general. to provide a new and novel device for honing by a continuous method which compensates for stone wear. which is simple in adjustment and positive in operation.

Other objects and features of noveltyA of my invention will be either specifically pointed out or will become apparent when referring, for a better understanding of my invention, to the following description taken in conjunction with the accompanying drawings, wherein:'

Figure 1 is a sectional view of a machine spindle for reciprocating, rotating, and adjusting a honing tool, which embodies features oi my invention;

Fig. 2 is a sectional view of the work holding portion ofthe machine and the table which reciprocates the work over the honing tool;

Fig..3 :ls an enlarged view of the structure illustrated in Fig. l, with the tool in expanded position; y

Fig. 4 is an enlarged sectional view of the structure illustrated in Fig. l, taken on the linev 4 4 thereof;

Fig. 5 is an enlarged sectional view of the structure illustrated in Fig. 1, taken on the line 5 5 thereof i Fig. 6 is a sectional view of the structure illustrated in Fig. 3, taken on the line 6-6 thereof;

Fig. 7 is a sectional view of the structure illustrated in Fig. 3 taken on the line l-l thereof; Fig. 8 is a front view in elevation of structure, similar to that illustrated in Fig. 1, showing a modied form thereof;

Fig. 91s a sectional view of the structure illustrated in Fig. 8, taken on the line 9 9 thereof Fig. l0 is a sectional view of the structure illustrated in Fig. 8, taken on the line IO-l thereof;

Fig. l1 is an enlarged sectional view of the structure illustrated in Fig. 10, taken on the line |I-|| thereof;

Fig. 12 is an enlarged broken sectional view of the structure illustrated in Fig. 10, taken on the line |2|2 thereof;

Fig. 13 is a sectional view of the structure illustrated in Fig. 12, taken on the line |3|3 therey trated in the foregoing iigures;

Fig. 18 is a broken view of the manifold illustrated in Fig. 17, with the valves Ishown in starting position; and

Fig. 19 is a view of the structure illustrated in Fig. 18, with the valve shown in position to render the honing machine inoperative.

T he mechanism for driving the tool in rotation and reciprocation is substantially the same as that illustrated and described in the abovementioned Kline et al. application. The struclture embodies a sleeve I which forms the outer wall of theA spindle and is preferably of cylindrical form. A nose I6 is provided with a central cylindrical aperture |1and fluid portsl I8 and |9. Within the central aperture |1 a sleeve 221s mounted having apertures 23 and. 24 in communication with the fluid ports` I8 and I9, respectively. The sleeve is secured to an enllarged end of a shaft 26 by a pin 21 to join the sleeve to the shaft. The enlarged end of the shaft forms a cylinder for a piston 3| which moves within the sleeve 22 ,and is provided with a reduced end portion 32 to have clearance at the inner end of the piston.

A hollcwshaft 34 extends forwardly of the piston operating in a sleeve 35 which isy threaded within the end of the sleeve 22. The hollow shaft 35 has a sleeve 4| jcurnalled at 4|a and splined thereto at 4|b. 'I'he shaft has a pulley 42 secured in driving relation. A suitable belt 43 is employed for driving the pulley 42 in rotay tion. Over the sleeve 4| a sleeve 44 is mounted for rotational movement relative thereto on a bearing 45. 'I'he outer surface of the sleeve 44 is supported by roller bearings 46 which are secured to a sleeve 41 attached to the ends of the sleeve |5 by pins 48. On the rear end of the sleeve 44 a pulley.40 is secured in driving relation, being disposed adjacent to the pulley 42 and driven by a belt 43 both of which are driven 'from a common motor 33; The pulleys 4l and 42, as well as the driving pulleys 40 and -42', may be of diierent radial dimensions so as to vary the relative speed of operation oi the honing tool in rotation and reciprocation.

The sleeve 44 has on its forward end an annular flange 49 provided with a slot 5| in its face for receiving projectionsv 52 on a washer 53 to form a driving connection. The washer 53 Y has a cylindrical receptacle 54 in which a ballshaped projection 55 on an inner raceway 56 is mounted for gyrating sliding movement. The outer raceway 51 of the bearing ls secured within a cap 58 having a lug`59 .which projects through an aperture 6| in a sleeve 62 having spaced anges 63, A pin 64 has its flat face 65 extending between the flanges 63 when projected through the aperture of the lug 59 to provide a pivotal driving connection therebetween.

A rod 66 extends through the hollow interior of the shaft 26 and has a threaded end 81 in engagement with the thread 88 on the inner wall of the shaft. A slot 69 is provided on the end of the rod 66 in which a split washer 1I is mounted through a slot 12 in the sleeve 62 secured in position by a spring ring 13. The split washer 1| locks the sleeve 12 to the rod 66 for longitudinal movement therewith. 'I'he rod 88 is the joining means between the sleeve 62 and the cap 58 and no reciprocation could occur except for this threaded connection. By turning the rod 68'by means of an attached thumb nut 14 the sleeve 62 is moved longitudinally on the shaft26 to regulate the degree of tilt to the cap 58 on a pair of balls 60 on which the cap is pivoted to thereby regulate the degree `of reciprocation of the workpiece, or tool that is supported on the end of the sleeve 38.

The pulley drives the inner races 56 of the bearings while the pulleyv 42 drives the shaft 28 and, through the balls 69, the cap 58 in rotation. When both the shaft 26 and raceway 56 are rotated at the same speed no reciprocation occurs to the sleeve 22. When one is rotated and the other retained stationary a simple harmonic motion is produced. When the driving speeds are dissimilar the simple harmonic motion becomes a hunting motion which will repeat itself only after operatingan aappreciable length of time. After the rod 86 has been adjusted to provide the desired degreerof oscillation to the sleeve 22 a clamping nut 10' may then be employed to maintain such adjustment.

The 'nose I6 has an extending sleeve 16 secured by set screws 11. A sleeve 18 is rotatably mounted upon the sleeve 16, retained against longitudinal movement by a plurality of balls 89. A sleeve 8|, having an internaLthread 82 has an outer raceway portion 83 on its inner end which forms a bearing with an inner raceway portion 84 coupled by balls 85. A slot 86 is provided in the wall of the sleeve 35 through which a pin 81 extends when joining the -piston extension 34 to the raceway 84. The movement of the piston moves the rod 34, the pin 81, the raceway 84, and the sleeve 8| to advance or retract the abrasive tool. The movement is limited by the end of thesleeve 35 against which the piston abuts in its forwardA movement and by the projection 32 during its rearward movement.

' Referring more particularly to the enlarged view of Fig. 3, a ring gear 88 of material width is secured on the inner side.of the adjusting sleeve 18 by a lpin 19 to rotate therewith. A pair 'of pinion gears 89 are journalled in the outer portion of the sleeve 8| through which the gear teeth project to engage teeth 9| on an outer race 92 which forms a roller bearing with an* inner race 93 and spaced rows of balls 94. The

teeth 9| ofl the race 92 are provided with a thread 95 which mate with the thread 82 provided on the inner wall ofthe sleeve'8I. A-tool adjusting head 96 is longitudinally movable within the end of the sleeve 35. A pin 98 ex- I, tends through diametrically disposed slots 91 for 'connecting the head 96 to the'inner race 93 of through the movement of the piston 3| and the additional movement produced` by. the rotation of the sleeve 18. The sleeve 35 has a anged collar 99 threaded thereon. A driving element |0| is mounted forwardly of the collar 99 supported in .position by a iianged sleeve |02. A ball bearing |03 is mounted between the flange and the tool supporting element.

A tool is mounted on the-supporting element |0| by a anged sleeve |06. The tool embodies a tubular body 'portion |01 having a anged sleeve |08 thereon in the flange of which a pin |09 projects to extend in an aperture in the tool driving element |0|. A pin ||2 prevents the relative rotation between the body portion |01 and the sleeve |08. Axially movable within the body portion is a rod ||3 having a conical extension ||4 on its forward end. A collar ||5 is mounted on a stub ||6 on the inner end of the rod ||3 which is supported by a pin |1 on the projection ||8 of the attaching head ||9. A

ball |2| permits the universal movement of the rod i|3 relative to the head |I9.

The head ||9 ts within a recess |22 provided l in the forwardV end of the adjusting head 96..

An annular slot |23 is provided in the periphery of the head 9 for receiving a ball |24 to form a lock therefor. The ball is positioned in a slot |25 in the wall of the head 98 which mates with a recess |21 in the wall of the sleeve 35 at the forward end of the sleeve. When the head 96 is adjusted to its forwardmost position by the pistonand the adjusting sleeve 18 the ball enters the slot |21 in the sleeve 35 thereby releasing the ball |24 from its position within the annular slot |23 in the head I |9 sothat the'head ||9 is removable from the head 96. It is therefore a simple operation to attach the head of the adjusting device to the adjusting head 98. At the end of the forward movement of the adjusting device the release of the -head ||9 from the head 96 is automatic. After the'head ||9 is inserted in the head 98 the operation of the piston, as4

viewed in Fig. 1, will draw ,the heads 96 and |99 to the left, moving the ball from the slot 21 to lock the heads together.

As illustrated in Fig. 2 the tapered end portion ||4 oi the yrod ||3 engages the inner sloping surfaces of the stone holders |30 on which-stones |3| are secured in any suitable manner, well known in the art. Spring ngers |32 are secured in slots in the tool body |01 which extend over the stone holders |30 for urging them radially inwardly. As the rod ||3 is moved ,to the right, as viewed in Fig. 2, the abrasive stones |3| are moved radially outward against the pressure of the springs 32 and when the `rod ||3 Ais moved to the left the spring moves the stones toward the axis of the body |01.

The washer |00 is provided with four slots |04 and with four apertures |05, The driving head |0| is 'provided witha pair. of pins |30 which project within a pair ofthe slots |04 `in which rollers |3| are mounted. A similar pair.of pins |30 (not illustrated)l are supported in the collar es 'and project in the mammal pair of slots |04 for the purpose of providing driving connection while at the same time permitting the .driving head IUI t0 atwithin the flanged sleeve.

|02. A plurality of balls ||0 are disposed in the apertures |05 to provide a thrust bearing relation therewith. Since the adjusting rod ||5 is mounted for universal movement on the projection I0, the entire tool is free to oatrelative to the workpiece so that the tool and workpiece need not be accurately aligned.

Now referring to Figs. 8 to 16, inclusive, I have illustrated a structure which cooperates with the adjusting sleeve 18 and the other mechanism associated therewith for providing auto- 'matic advancement of the sleeve and therefore assumed and compensated for.at the end of each operation. `For example, on a hard steelV with a soft stone to remove approximately 1A000 of material in a 1A inch hole substantially 1,i000 of the stone diameters will be removed. As a result, when Va plurality of successive workpieces are being machined, the adjusting mechanism may be set to allow for a l,i000 change in diam- .eter of the tool for each operation. 'I'he degree of expansion oi the Atool during the operation being xed, all of the workpieces being machined should be iinished to a desired diameter within fractions of a tenth of athousandth of an inch.

'I'he sleeve 18-is provided with a pair of ratchet wheels |33 and |34 having teeth of opposite hand aligned thereon. That is to say, the teeth on the wheel |33 are disposed to turn the wheel in a counter-clockwise directionwhile the teeth on the wheel |34 are disposed to turn the sleeve 10 in a clockwise direction. A housing |35 for sup-A porting the sleeve I5 of the device contains a cylindrical aperture |36.

longitudinally on a stationary hollow piston rod |38. Suitable packing material |39 seals the end of the cylinder on the rod. Similarly, on the rod a piston |4| is secured while passageways |42 and |43, respectively, are provided through the rod |38, terminated at the right and left hand side of the piston, respectively. Caps |44 in the end of the cylindrical aperture |36 forma support for the piston rod |38 and a passageway for the fluid to the apertures |42 and |43. The aperture |42 communicates through a passageway '|45, through a control valve |46, for regulating the ow of iluid from the. passageway. When iluid is introduced to the passageway |42 it is passed around the valve |46 through a passageway |41 closed by a ball\check vvalve |48 when .is mounted for rotational movement on the sleeve A cylinder |31 ismounted within the aperture |30 to be moved j on tite ratchet meriti., A angerv l a `come'incitation `if .the cam el I5. A sleeve |55 encompasses the ring gear |54 'and the cylindrical extension thereof. A slot |58 in the ring `gear |54 has a ratchet finger |51 pivoted therein urged by a spring |58 into engagement with the teeth of the ratchet wheel |33. A similar slot |58 in thevring gear |54 contains a ratchet nger |5| for engagement `with the teeth 0f ratchet Wheel |32 urged into engagement by a spring |82. A cam element |53 operates in a slot |54 in the sleeve l|55 for the purpose of engaging` a projecting end |66 8 provides to-ascale |58. providedV omthe f' thef sl'eve |55. `V'I'hecau'l is maintained in position.` by a thu'mbscrew |1|. L v

A plunger |12 is supported in the ange ofthe sleeve |55 in position to engage the extension |13 of the cam linger Ill when the ring gear is in initial operation position, that mustmted in Fig.

a thumb screw |18. An indicating finger |19 locates the position of the block relative to a scale |8| mounted on the flange |55.

In Fig. 9, I have illustrated the housing |35 as being provided with a cylindrical aperture |82 having a spool |33 rotatable therein. The spool is rotated by a stem |84 from an adjusting knob |85 containing a scale |185v which is attached to the rod |84 by the spool for accurately positioning the spool in accordance with the scale on the knob. Fluid is introduced through the aperture |82 into the'passageway |43 where it operates on the left hand end of the cylinder |31 to move the cylinder to the left, as viewed in the ligure. the cylinder |35 must be forced through the passageway |42 and through the 4valve |46 to the tank.

The valve is provided with a V-shaped notch |81 by which the fluid from the passageways |42 and |45 is metered. Ablock |88 closes the aperture |89 so that the fluid entering the notch |81 will pass through a slot |9| into the tank through aperture |92 by a suitable conduit attached thereto. After the cylinder |31 has moved to the left the fluid is reversed in the passageways |88 and |92 and the pressure entering the latter passageway will beby-passed by the ball' check versalmovement so that its surface will align time the motor 33 is energiaedto drive the tool in reciprocation and 4rotation while the table 202 continues to strokethe workpiece over the stones. The table movement superimposes a vslow4 feed movement in reciprocation onto the rapid recip- The fiuidin the right hand end of Y valve |48 into the passageways |45 and |42 to move the cylinder |31 to the right, to the position illustrated.

The fluid on the opposite end of the cylinder will flow from the passageway |43 and |98 without restriction so that a rapid return movement of the cylinder is thereby obtained. Annular grooves |94 and |95 are provided at each end rocation produced by the drive mechanism. When the structure, as illustrated in Fig. 1, is employed, the operator Vperiodically grasps the sleeve 18 and rotates it clockwise to advance the abrasive stones toward the wall being machined until a desired diameter is reached.

When the construction illustrated in Fig. 8 is employed, the stop block |18 and the cam block |83 is first set so as to regulate the degree of advancement of the sleeve 18 as well as its amountof retroactive movement. Fluid is introduced into the opening |98 to move the cylinder |31 to the left under control of the fluid in the right hand end of the cylinder which is metered through the valve |35. This movement rotates the pinions |5| and |53 which in turn rotate the ring gear |54 to rotate the sleeve |18 by the connection "of the pawl |5| with the ratchet wheel |34. being carried along therewith.

Before the end of this advance movement, the pawl |51 engages the end of the cam |53 which releases the pawl from the ratchet wheel |33, both of which continue to advance in the same predetermined relation to each other. This o ccurs because the pawl |51 is carried by the ring gear |54 and the ratchet wheel |33 is attached to the sleeve 18 which is advanced by the ratchet wheel |34. The advancement of the stones continue until the stop block |14 engages the block |16 and thereafter machining is continued for a short time without further advancement of the stones to complete the finishing operation.

Thereafter the fluid is reversed to retract the piston 3| which retracts the rod ||3 and permits the stones' |3| to contract. The reversal of uid also interrupts the stroking movement of the table 202 which is returned to its initial position with the work moved away from the tool. The reversal of the ow of iiuid moves the cylinder |31 to the right and rotates the ring gear |54 counterclockwise. During the initial movement of the ring gear, the pawl |51 will be held out of contact with the teeth of the ratchet wheel |33 by the cam |53 and no movement will occur to the sleeve |15. After a predetermined degree of return movement, regulated by the position of the cam |83, the projecting end |85 of the pawl |51 moves out ofcontact'with the cam |63 and the pawl |51 moves into engagement with position by suitable means as by a thumb nut the teethof the ratchet wheel |33 and returns the ratchet wheel and sleeve |13 to a new initial position. It will be noted that the sleeve |18 is moved clockwise a Agreater' amount than in the counterclockwise direction, the difference in movements adjusting the stone diameter con-I The ratchet wheel |33 and pawl |51 compensate for the amount of wear may'be obtained empirically and the degree of advancement of the abrasive stones during the honing operation to machine to a desired diameter is selected in a like manner.

The tool begins each operation with the stones set at a desired diameter and after being moved to engage the surface of the bore by the movement of the piston 3| -is thereafter advanced a predetermined amount; to machine the bore to a desired diameter. '\After each operation the expanding mechanism is retracted a less amount to compensate f or stone wear so that the tool will :have the same diameter that it had at the beginning of the operation.

Referring to Figs. 17, 18 and 19 I have illustrated diagrammatically the uid circuit em- I ployed to produce the automatic operation of the machine to have it perform the complete cycle to move the workpiece over the honing tool, t expand the abrasive stones of the tool, to drive the tool-in rotation and reciprocation. to expand the abrasive stones during the honing operation, to stroke the workpiece over the tool, to continue the machining operation after the expansion of the abrasive stones, and tc collapse the abrasive stones and move the workpiece out of engagement with the tool.

A pair of pumps, 205 and 206, are driven from a shaft 201 and supply fluid to the manifold 2|2. A pressure relief valve 209 is connected in the circuit of the pump 205 while a relief valve 2|0 is connected to the pump 206, the latter valve having an operating knob 2|| by which it may 231 to move the body to the left, as illustrated in the figure. This produces a ow of fluid from the pressure line C to the line D which operates the piston 3| in the cylinder I5 for producing the initial expansion of the honing stones within the bore of the workpiece. Pressure also passes through the circuit 244 into the upper end'of the cylinder 245 for moving the timing valve 249 downwardly therein. A time control-,of the movement of the valve 246 is effected by'r-the control -introduced into the opposite port is cut off from' the tank by the valve body 231 and the uidmust I therefore flow through one or the other now conbe readily adjustable. The manifold 2|2 controls returns all of the uid under pressure to the tank so'that the operation may be interrupted f at any point in its cycle. a

When theJtable 202 is moved to the right the valve body 226 is positioned at the left in view of the fact that the dog 221 is in the dot and dash line position 228. Fluid from the port A passes through the circuit 229, through the circuit 23|, through circuit 232, through the ballcheck 233 to the righthand end of the cylinder 234 for moving the valvebody 235 to the right. Fluid from the port A then iows into the port E, while uld from the port F passes from the circuit 236 through the valve body 231 a'nd to tank. This produces t'he high speed operation of the table- 202 to the left. 'I'his movement rocks the dog 221 to the dash line position illustrated in Fig. 18 .to move the valve body 226 to the right. Pressure from the port A passes through the circuit 229 through the circuits 239 and 24|, through the ball-check valve 242 into the opposite end of the cylinder 234 to operate the trol valves 248 to control the movement ofthe table by controlling the flowof the exhaust fluid on the side of the piston opposite to that into which pressure is being introduced.

Pressure is introduced from thev conduit 2|@ through the conduit 222, as illustrated in Fig. 17,

to the piston |31 to produce movement of the cylinder which produces the feed movement of the stones during the honing operation. The table will continue to reciprocate in this manner until the handle 2|4 is reversely moved manually to the position illustrated in Fig. 19, or until the piston 246 moves to the bottom of its cylinderv for permitting the fluid in the circuit 249 to pass through the, circuit 25| to operate the valve body 225 to the left.` This movement cuts off the ow of fluid through circuit 23| so that when the dog 221 is moved into the position r228 herei illustrated, fluid through the circuit 232 to the end of the cylinder 234 is cut olf and the valve body 235' will not be reversed so that the table 202 will 'continue to travel to the right.

Fluid from thecircuit 249 also passes through the circuit 252 to the circuits 253 and 254 to the lefthand end ofthe valve body 231 for moving it to the right. rIn this position the fluid to the pistons 3| and |31 is out off and uid from the circuit 256 is introduced into the righthand" side of the pistons |31 and 3| to produ the contraction of the abrasive stones.

Fluid from the port E now passes through the circuits 251 and 258 to tank. This permits the rapid travel of the table to the right as the workpiece is moved away from the honing tool. Fluid from the circuit 252 passes through the ow control valve 249 by unseating the cball 259 to deliver fluid to the lower side of the piston 256 for lmmediately returning the piston to the top side of the cylinder. Control valve 26| is employed in the position and their operation interrupted.

valve body 235 to the right, the position illuscuit' 24a to the rignthand end of the valve body It has been pointed out hereinabove that the return movement of the cylinder |31 operates a madeftherein without departing from, the spiritv andiscopelof the invention, as set forth in the accompanying claims. i

What-is claimed is: l. In a honing device, a tool, a plurality of radially adjustable honing stones on said tool,

cam means for moving said stones radially, means for moving said tool in reciprocation and rotation, fluid means for moving said cam means wlille said tool is, operating, a rotatable sleeve through which said tool is operated, and mechanical means between said iiuid'and cam means operated by the movement in rotation of said sleeve for,additionally moving said cam means while the tool is operating.

2. Ina honing device, a honing tool, abrasive stones on said tool, a longitudinally movable cam for radially moving said stones,a rotatable sleeve which is normally stationary from which said tool `projects. and mechanism interconnecting said sleeve and cam for moving said cam when said sleeve is rotated.

3,-In a honing device, a honing tool, abrasive stones on said tool, a longitudinally'movable cam for radially moving said stones, a rotatable sleeve from which said tool projects, an internal gear secured to said sleeve, a second rotatable sleeve disposed within said ilrst sleeve and retained v against axial movement relative toA said cam and having an internal thread, a gear having threads on the top face of the teeth engaging the thread of said second rotatable sleeve, and gears 'carried by said second rotatable sleeve joining the teeth of said threaded gear with those of the internal gear. f

4. In a honing device, a honing tool, abrasive stones on said tool, a longitudinally movable cam for radially moving said stones,a rotatable sleeve from which said tool projects, an internal gear secured to said sleeve, a second rotatable sleeve disposed within said ilrst sleeve and retainedv against axial movement relative to said cam and having an internal thread, a gear having threads on the top face of the teeth engaging the thread of said second rotatable sleeve. gears carried by said second rotatable-sleeve joining the teeth of said threaded gear with those of the internal' gear, and means joining the threaded gear to the cam.

5. In a honing device, a honing tool, abrasive stones on said tool, a longitudinally movable cam for radially moving said stones', a rotatable'sleeve from which said tool projects, .an internal gear secured to said sleeve, a second rotatable'sleeve disposed within said ilrst sleeve and having an internal throad,a gear having threads on the top sleeve in said inner race lhaving a slot, a cam supporting head in said last sleeve, and a pin extending through said slot and joining said inner race with said cam supporting head.

6. In a honing device, a honing tool, abrasive stones on said tool, a. longitudinally movable cam for radially moving said stones, a rotatable sleeve from which said tool projects, an internal gear secured to said sleeve, a second rotatable sleeve disposed within said rst sleeve and having an internal thread, a gear having threads on the top face of the teeth engaging the thread of said second rotatable sleeve, gears can'ied by said second rotatable sleeve joining the teeth of said threaded gear with those of the internal gear,

an inner race, balls joining the inner race to the' inner surface of said threaded gear forming a thrust bearing relation therebetween, a rotatable sleeve i'n said inner race having aslot, a cam supporting head in said last sleeve, a pin extending through said slot and-joining said inner race with said cam supporting head, and a piston connected to said support for retaining said last sleeve against longitudinal movement for adjusting said support and' advancing said cam.

7. A thrust bearing having an inner and outer race, and gear teeth on the periphery of the lface of the teeth clinging 'the thread of said secondy rotatable sleeve', 'gears carried by said second rotatable sleeve joining the teeth of said threaded gear with those of the internal gear, an inner race, balls .ioining the inner race to the inner surface of said threaded gear forming .a thrust bearing relation therebetween, al rotatable outer race thereof.

8. A thrust bearing having an inner and outer race, gear teeth' on the periphery of the outer race thereof, and threads on the outer ends of the gear teeth.

9. A threaded cylinder, teeth cut normal to said threads forming a gear with thread portions on the ends thereof. i

10. A threaded cylinder, teeth cut normal to said threads forming a gear, a bearing race adjacent the inner wall of said cylinder, and antifriction elements joining said bearing race to said cylinder in bearing relation,

1l. In a honing device, a rotatable sleeve having an internal thread and slots in its wall, a piston for positioning said sleeve longitudinally, a threaded cylinder having longitudinally disposed teeth threaded in said sleeve, a bearing race within said cylinder, anti-friction elements Joining said race to said cylinder, an internal gear surrounding said sleeve, and gears carried in the slots in said nrst sleeve, the teeth offwhich project therefrom into engagement with the teeth of the cylinder and those of the internal gear.

12. In a honing device, a rotatable sleeve having an internal thread and slots in its wall, a piston for positioning said sleeve longitudinally, a threaded cylinder having longitudinally disposed teeth threaded in said sleeve, a bearing race within said cylinder, anti-friction elements joining said race to said cylinder, an internal gear surrounding said sleeve, gears carried by said sleeve band extending through the slots therein into engagement with the teeth of the cylinder and those of the internal gear, a sleeve having a slot in its wall disposed within said bearing race, a tool carried 'by said sleeve, and a cam receiving head within said sleeve joined through said slot to said bearing race.

13. A rotatable and reciprocable sleeve, a longitudinally movable supporting head having a ball receiving aperture, a ball receiving slot at the end of said sleeve, a tool, an adjustable cam in said tool having a head insertable in said supporting head, said cam head having an annular slot in which the ball is insertable for locking said headsA together when moved away from saidslot in the sleeve.,

14. In a honing device, an abrading tool, abrasive elements carried by said tool for radial Inovement, a cam for producing radial movement of said elements, iiuid means for operating said cam, mechanical means between said uid means and cam for further moving said cam during each honing operation, and means for retracting said 'cam a predetermined lesser amount than said advancement to compensatefor wear ofthe abrasive elements.

15. The method of honing which includes, the rapid advancement of the honing stones of the tool to a predetermined diameter, the slow feeding of the stones during the honing operation, and the retraction of the stones afterthe operation an adjustably lesser amount than said advancement to compensate for stone wear occurring during each honing operation.

16. The method -of honing which includesthe steps of reciprocating and rotating a honing tool, of 'stroking a workpiece in reciprocation over said tool, and of rapidly expanding the stones of the tool to honing position, of further advancing the stones during the honingpperation to a desired diameter and of retracting the stones a -1ess amount than the expansion to the original stone diameter.

17. The method of honing which includes the steps of reciprocating and rotating a honing tool, of stroking a workpiece in reciprocation over said tool, and of rapidly expanding the stones of the tool to honing position, of further advancing the stones during the honing operation to a desired diameter, and of retracting the stones, upon the conclusion of said operation, an amount equal to the total of said expansion and advancement less the amount of wear occurring on said stones during said operation.

18. The method of honingwhich includes the automatic compensation for wear occurring on abrasives, as a result of their operation on a workpiece, during the retracting phase of eachhoning operation by returning the hone to the diameter which it had before the wear occurred.

- DOUGLAS 'I'..Panzazriv 

